Positive-pressure blower.



P. P. BOLAND.

POSITIVE PRESSURE BLOWER.

APPLICATION IILED NOV. 8, 1009.

Patented May 24, 1910.

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959,049. Specification of Letters Patent. 'Pateflted 24 1910.

- Applietion filed No'veu'xberS, 1909. Serial No. 526,771.

To all whom'it may concern: a true, its length being practically equal to Be it knownv that I, FRANCIS P. .Bom'rm, the distance between, the" adjacent faces of a citizen ofthe United States, residing at the heads I), and is provided with a central Providence, in the county of Providence and hub, In, keyed to thesaid shaft 8, The hub State of-Rhode Island, have invented certain ortign'gissomewhat shorter than the riin, 60 new and useful Im rovements in- Po sitive'-" jeing in fact substantially the same as the 1 Pressure Blowers, which the following is distance between the inner faces of the said a specification. a? enlarged pa'jrts b The piston-is provided My present i ti r lat t v= with'a plurality of-slotted 0 enings, 0 ex-. ments in rotary pressure bldwer's', and it Qtendingradralbr from the hu 'h to the'pis- 65 consists essentially in the novel construction tons periphery. The inner faces of the side of the blades or wings, and means for posi- Walls 6 of each opening are parallel and tively insuring continuous engagement of the adapted'to' receive and support there e we blades with the bore of the cylinder; all as a movable'blade C, soonto be described; fully hereinafter described and claimed. The ends of said walls oi'varins adjacent the to The obects sought to be attained are as heads 5 are Cull aw y 0 6 fit t' i follows: '10 roducea rotary pressure blower are also flush with the ends of the hi1b =h, that is simp e in construction, comparatively so as freely pass the stationary parts b inexpensive to manufacture; having a mini- The piston further proy dedwith the 2o mum number of parts; reduced weight,pracu r rlm 8806 01134 and also thefcentral, 75. ,tically frictionless and noiseless when in actransverse e f =1} Y 'tion; readily accessible for inspection or re- In blowers, as usually -constructed, 'the pair, and ossessing increased efliciency. f a y, PY Q blades llloll'lltedn j In the rawings herewith, Figure 1 repre- 'revoluble piston are made of mb 1 l{;thuS 1n sents, in partial front elevation and section creasing the weight of the movmgdpart1s,-so

mg y

(the latter being taken on.line 1 1 of Fig. 2) while at the same time the correspon a rotary pressure blower embodying my 1n-' incre C ntrifugal force produc ea e -vention. Fig. 2 is a longitudinal sectional friction and, Wear, to overcome whic "relaview, taken on line 2 2 of Fig. 1. Fig. '3 tively greater power must be expended. Y I In my improved blower I prefer'to use ary rings or collars, detached; and Figs. 4 o -metallic blades, L'madejof comp and 5 represent side and and elevations, re- Suitable fibrous mater1al'produced,sa from s actively, of the blade itself, slightly modiwoo paper or rag pulp.- The bla es are d, light, plain rectangular-shaped members 35 Again referring to -the drawings, A desighayin their inner and outer edges, 0 and 0, nates my improved rotary pressure blower, sultab y shaped and adapted to bear lightly as a whole. The cylinder or casin a is against the adjacent-stationary. rfaces-of 1 bored true throughout its len h, an prothe cylinder and its-twocenter ubs; the" vided with suitable intake and ischarge nozends of the blades at the sametime being'in substantial engagement with the lnner faces lists clearly shown inFigs.

a secured to each end of the casing, the same of the heads I5, a

as drawn, having outer and inner hubs form- 1 and 2. g ing alining bearlngs for the horizontal driv- In blower s'of the type referred to,.and as ing-shaft s. The inner part, b, of the bearusually devised, wherein a true cylindrical 45 ing portion is enlarged and also concentric piston 1s revolubly mounted eccentrically to l with the center of the head, while the outer and within the bore of the casing a, therela-h portion is disposed eccentrically to it, as .tlon of the one td the other is such that durclearly shown. As usual in blowers of this rug bertain portions of each revolution the type, the'bore of the said bearing is disposed lnner or lower edges of the blades do not respect to travel, in a perfectly true circular path,

the casings axis the amount of such eccenthat 18, a path ooncentrlqwllh the boreOf the tricity being equal to one-half the throw cas ng, thereby producing irregular blade I or radial movement of the blades carried by action, permittln a. greater percentage of the revoluble piston. loss by leakage o the'alr or fluid bemg act" 55, The piston B is cylindrical and turned off ed upon, and also producing increased wear, 11o

Moreover, in case'the blower is actuated at ajcomparatively slow s eed rate, the blades .are liable to, and in act do, make a dismg-. devic es for- 1 w the blower,

.part '0 of the hub of each head 6 is turned ofi' true and concentric with the casinggs agreeable noise by reason of the lost motion vor play due to such construction. In some cases the working edges of theublades are provided with resilient or self-acting overcoming the 'ob ections j ust referred to;

In order to simplify the construction. and at the same time increase -the'efticiency of the peripheral face of said inner bore, and provided with a thin steel ring,

removably secured thereon. The ring is bored tosnugly receive the said hub part, and secured in position by pins or screws 7. The ring member is not wholly'uniform in thickness, or annular, but is slightly elli tical or-oval, being provided with opposite y members, if,

disposed, peripheral, cam-like pro ections, d which merge gradually into andare integral with the other or more concentric portions of the ring. See Figs; 1 and 3. These are devised and positioned-so that a uniform distance is maintained laterally or radially between the bore of the. 'casin said and the istance, bein' or width of the bin obvious thatthe opposite edges, 0 of the blades are in continuous frictional engagement, respectively, with the casings bore and the periphery ofthe ring D throughout the revolution of the piston.

perimeter of the ring D; the just equal to the depth des- C. Thus it will be If desired, the blades inayg be. further Y stifiend or strengthened by'means of thin pack-- binat ion and c,-

disposed eccentrically to and revolublyl mounted in the casings chamber, and a lurality of blades, uniformly alike in width and length, movably mounted in and carried bodily by the piston; the contour surface of the said hubs in connection with the bored surface of the casing forming a space therebetween such that, when in action, the inner and outer edges of the blades are adapted to be in substantial continuous frictional contact with said surfaces during each revo- 'lution of the piston.

2. In a blower of thecharacter described, provided with a casing and 'a revolubly mounted blade-carrying head members secured to the casing, each having an inner hub centrically therewith, and a thin, oval- .shaped metal-ring bored to receive said hub and being removably secured to and posi 'tioned upon it, for the purpose hereinbefore set forth.-

In testimony whereof I have affixed signature in presence of two witnesses. 7

v FRANCIS P. ,BOLAND.

' Witnesses: I

GEO. H. REMINGTON,

CALVIN H. BROWN.

piston, apair of portion disposed con- 

